engine: Changing HA Reservation alert interval to 10 min

Changing the interval which an alert of
HA reservation can be invoked from 1 hour to 10 min

Change-Id: Icb7665c335a00ac6cee67e1293d8a93409d79ca2
Bug-Url: https://bugzilla.redhat.com/1076211
Signed-off-by: Kobi Ianko <kobi@redhat.com>